Portable grinding machine



Oct. 23, 1923. w

R. w. OPFEL PORTABLE GRINDING MACHINE Filed March 26. 1921 3 Sheets-Sheet 1 INVENTOR .R W Opfe 2,

BY %Loq WITNESSES A TIDE/V578 R. w. OPFEL PORTABLE GRINDING MACHINE Filed March 26. 1921 s Sheets-Sheet 2 Oct.

\m T 2523: V

ilwmrdn R W Opfel,

W m m n 4 TTOR/VEYS proved grinder.

' Figure 2 is a fragmentary front elevation Patented 0a. '23, 1923.

UNITED STATES PATENT oFl-uce.

ROYAL w. OPFEL, or cunno, arms.

POFTABLE GRINDING MACHINE.

Application filed 1mm 26, 1921. Serial 1%. 455,740.

To all whom it may concern.-

Be it known that I, ROYAL W. OPFEL, a citizen of the United States, and a resident of Cuero, in the county of De Witt and State of Texas, have invented certain new and.

useful Improvements in Portable Grinding Machines, of which the following is a specification. i

This invention relates to improvements in grinding machines especially adapted for grinding the cylinders of engines and the Other obi'ects and advantages of'the in-.

vention wil be apparent during the course of the following descri tion.

In the accompanying rawings forming a part ofthis application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is aside elevation of the imof the same, parts being shown in section,

Figure 3 is a detail horizontal sectional view through the improved grinder, the view illustrating the means for transmitting the power to the several rotary elements embodied in the invention.

Figure 4 is a vertical detail sectional view illustrating the means for automatically reversing the direction of travel of the grinding mechanism when the same reaches its limit of movement in one direction orwhen the grinder reaches one end of the cylinder. Figure 5 is a vertical detailed sectional view taken on line 5-5 of Figure 4.

Figure 6 is a vertical transverse sectional view taken on line 6-6 of Figure 4.

Figure 7 is a vertical transverse sectional view taken on line 77, of Figure 4.

Fi re 8 is a detailed view through a housing inwhich is arranged in erfitting the-numeral 13. The housin bushin s which are employed for varying the ra ius of the cutter.

Figure 9 is a plan view of a power transmitting member embodied in the invention. Figure 10 is a fragmentary side elevation of the same.

Figure 11 is a detailed sectional view taken on line 11-11 of Figure 9.

In the drawings, the numeral 10 designates a base upon whlch a column or standard 11 is mounted. As illustrated in Figure 3, the column 11 is substantially semi-circular in cross section and has its edges formed with' laterally projecting flanges 12 which form guiding means for a housing designated by 13 is formed with a pair of longitudinal s ots which are substantiall fL-shaped in cross section for receiving t e laterally projecting flanges 12 and the adjacent portions of the column,

whereby the housing is guided in its vertical movement. Due to the elongated formation of the housin and the fact that it contacts'; with the co umn at both of its ends the housing will not bind on the column when moved longitudinally.

With reference to Figure 2 it will be ob-' served thata' bushing 15 is arranged within and is provided with an eccenwhich receives an inner bushing 18. The bushin 15 and 18 extend for the entire length 0 the housin 13.

A grinding shaft 22 extends t rough the longitudinal opening 23- in the inner bushing 18 and as illugzrated in Figure 2, the opening 23 is off center. The grinding shaft the housin tric bore 1 22 which is rotated by means to be later described is provided at its lower end with a grinding disk 24 which is adapted to contact with the wall of a cylinder so as to grind or bore the same.

' During the rotation of the grinding shaft 22, the outer eccentric bushing 15' is freely rotated so that the grinding disk 24 will be moved in a circular path. The means em-" ployed formoving the outer eccentric bush mg 15 during the operation of the machine includes a inion 26 which on: lar series 0 teeth27 formed on t of the bushi b means 0 a shaft 28 which extends tliro h the uppe e riphe r flanged end of the hous ing. n operation, the shaft28 is revolved so that the eccentric bushing 15 will be anannu- 15. The pinion 26 1s rotate volved, whereby the shaft 22 will be moved in a. circular path as well as rotated. The inner bushing 18 is locked to the outer bushing 15 by means of an adjusting pinion 30 which has engagement with an annular series of gear teeth 31 formed on the periphery of the bushing 18. The pinion 30 meshes with the annular series of teeth 31 and is provided with an adjusting shaft 32 having its upper end formed with a head 34 adapted to be engaged by a wrench or the like so that the pinion 30 may be rotated for adjusting the inner bushing with relation to the outer bushing 15. By adjusting the bushing 18 with relation to the outer bushing 15 the radius of the grinder may be varied. For instance, when the inner bushing 18 is positioned as illustrated in Figure 3, the radius of action of the grinder is at its greatest point and when the inner bushing 18 is reversed the radius of action is decreased. By reason of the ad- 'usting shaft 32 being exposed the inner ushing 18 may be readily adjusted with relation to the outer bushing for varying the radius of action of the grinder.

The shaft 28 which is employed for rotating the outer eccentric bushing 15 has its upper end provided with a gear 36 which meshes with a gear 37' keyed or otherwise securedto one end portion of a transversely extending power transmitting shaft 37. The end portions of the power transmitting shaft 37 are supported by a pair of upstanding brackets 38 mounted on the upper end of the housing. The shaft 37 is provided adjacent one end with a spur gear 39 which is in mesh with a second spur gear 40 secured on the adjacent end of a shaft 41 rotatably supported by the upstanding brackets 38. The shaft 41 which is arranged behind and above the shaft 37 is provided at one end with a sprocket wheel 43 about which a sprocket chain 44 is trained. The sprocket chain 44 also passes about a sprocket wheel 45 secured on one end of a transversely extending shaft 46. The shaft 46 is provided ith a gear 48 which is constantly in mesh with a gear 49 secured on the armature shaft 50 of a motor generally designated by the numeral 51. Therefore, when the motor 51 is energized the shaft 46 will be rotated for imparting a corresponding movement to the shaft 41. The rotation of the shaft 41 results in the rotation of the shaft 37 and consequently the rotation of the vertical shaft 28. When the vertical shaft 28 is rotated the eccentric bushing 15 is rotated for moving the grinder in a circular path.

As illustrated in Figure 1, the motor 51 is supported between the spaced parallel arms 52 of a U-shaped bracket generally designated by the numeral 53. The U- shaped bracket 53 is secured at the rear of the column to the housing by means of updown during operation includes a feed screw 57 which extends for the entire length of the column and which is provided with-agear meshing with a gear 58 keyed or otherwise secured to a shaft 59. It might be stated that the shaft 59 is arranged directly beneath the shaft 41 and behind the shaft 37.

When the shaft 59 is rotated the gear 58 which meshes with a gear 60 on the feed screw 57 is rotated so that the housing will be raised or lowered, according to the direction of rotation of the shaft 59.

A driving connection may be established between the shaft 41 and the shaft 59 by means of a. gear 62 keyed on the shaft 41 and a gear 63 rotatably mounted on the shaft 59. A clutch section 64 feathered on the shaft 59 is adapted to engage a corresponding clutch section 66 connected to the gear 63 so that when the parts are positioned as illustrated in Figure 4, a driving connection will be established between the shafts 41 and 59. \Vith the gear 63 thus rigidly connected to the shaft 59, a clockwise rotation of the shaft 41 will result in an anti-clockwise direction of the shaft 59.

The direction of rotation of the shaft 59 maybe reversed by establishing a driving connection between the shaft 59 and the shaft 37. This may be accomplished by locking a spur gear 68 to the shaft 59 by means of engaging interlocking clutch sections 69 and 70. The clutch section 69 which is feathered on the shaft may be engaged with a clutch section 70 s that the gear 68 will be non-rotatably connected to the shaft 59. Since the gear 68 meshes with a gear 72 on the shaft 37 the engagement of the clutch section 69 with the section 70 will result in the rotation of the shaft; 59 in a clockwise direction whereby the direction of travel of the housing will be reversed.

The means for alternately locking the gears 63 and 68 to the shaft 59 includes a longitudinally movable rod 74 which is slidably through aligned openings in the upstanding brackets 38.- The longitudinally movable rod 74 is provided with upwardly extending arms 75 which are connected to the sections 64 and 69 so that the longitudinal movement of the rod 74 will result in disengaging one of the movableclutch sections and engaging the ther movable clutch section with the corresponding gear.

As illustrated in Figure 4, one arm of a bell crank 76 is connected to the rod 74 while the other arm of the bell crank is con- Inn III

nected to a vertically movable rod or plunger 77 which is adapted to be engaged by upper and lower stop elements 79. The stop elements 79 which are in the nature of lugs secured to the column are provided with set screws 80 which ma be adjusted for varying the point at whic the housing is reversed in its travel.

When the housing moves down the lower end of the rod 77 will contact with the set screw 80 carried by the lower stop element and a resulting upward movement of the rod will move the transversely extending arm 74 longitudinallyso as to engage the hub section 69 with the section 70 whereby the gear 68 will be locked to the shaft 59. With the gear 68 thus locked to the shaft 59, the direction of rotation of the shaft 59 will be reversed so that the housing will start onits upward movement. When the housing 13 reaches the limit of its upward movement the upper end, of the plunger 77 will engage the upper stop element so as to again move the rod 74 longitudinally. The means for rotating the shaft 22 includes a continuous belt which is trained about a pulley 86 keyed or otherwise secured to the upper end of the shaft.- The belt 85 is also trained about a pulley 87 secured on the upper end of the armature shaft 50.

The continuous belt 85 is trained about a series of pulleys 88 which are rotatable on a U-shaped yoke generally designated by the numeral 90. The U-shaped' yoke 90 includes an arm 91 which rotatably receives the shaft 22 and which overhangs the housing 13. The arm 91 of the U-shaped yoke 90 is provided with a lateral extension 92, which is adjustabl connected to a reduced extension 93 o the connecting portion of the U-shaped yoke.

have threaded engagement with the lateral extension'92 whereby the portions 92 and 93 may be adjusted with relation to each other. The other arm 95 'of the U-shapedv and is pivpath the arms of the yoke will move with relation to each other .80 that the belt will not be strained and so that the belt will remain in connection with the pulley. The lower rtion of the arm 95 is formed with a hes 98 which is mounted upon an annulaiseries of anti-friction elements 99. The annular series of antifriction elements 99 are mounted upon a disk 100 secured to the 11 per arm 52 of the yoke or brapke .53.

e arm 95 of course partakes of a pii Bolts 94 are extendedthrough a slot 103 in the extension 93 and rtion of L otal movement about the axis of the armature shaft as the grinder movesin an annular path. Suitable means such as brackets 102 may be employed for supporting the yoke 90 It will be observed that the grinding shaft 22 extends for a substantial distance beyond the housing 13 consequently the wheel 24 is located much in advance of the housing which permits the operation of the wheel to be closely observed and it also permits frequent measurements to be made. In this manner the production of over-size cylinders is overcome. In the use of the invention one end of the cylinder is secured to the base 10 and the grinder 24 enters the cylinder through the opposite or upper end. Thus it is not necessary to line up the cylinder after each grind.

As the grinding operation may be observed at any time the cylinder grinder 24 cannot by accident descend and enga e the head of a T or L shaped cylinder. his is an important feature of the'in'vention. It

will also be observed that the cylinder contact member 24 grinds on both the u and down strokes and consequently grin s the cylinder in a highly expeditious manner.

Attention is also directed tothe fact that the motor 51 is arranged on one side of the minimum and prevents rapid wear of the mo arts. p It is highly important to provide a means for fully observing the operation of the grinder as the. grinder which is sometimes an emery wheel glazes and lcks up the metal which causes it to cut an scar the object to be ground. This also causes the wheel to heat and possibly fracture and fig to pieces damaging the object to be groun and possibly injuring the operator.

With reference to the foregoing description taken in connection with the accompanying drawings, it will observed that the improved portable grindin machlne may be readily applied to a cylin er and the grinding of the cylinder completed in a short space of time thru the contact of the grinder with the wall of the pylinder.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is w 1. A grinding machine comprising a grinding shaft, a U-shaped yoke hav ng a rigid arm receiving said shaft, a belt having connection with said shaft, a motor having a shaft connected to said belt, said. yoke being provided with a pivotedarm connected to the shaft of said motor, means to sup rt said yoke, and means whereby said grin mg shaft and said motor are reciprocated. 2. A grinding machine comprising a shaft, a U-shaped yoke having an arm receiving said shaft, a belt having connection with said shaft, a motor having a shaft connected to said belt, said yoke being provided with a pivoted arm connected to the shaft of said motor, means to support said yoke, a bushing receiving said shaft and moving the same in an annular path, and means to reciprocate all of said elements.

A grinding machine comprising a U- shaped yoke having a rigid arm and a pivoted arm, a grinding shaft extending through said rigid arm, a motor having a shaft extended through said pivoted arm, a power transmitting device associated with said yoke, and an automatic reversing mechanism for reversing the longitudinal-travel of said grinding shaft.

4. A grinding machine comprising a U- shaped yoke having a rigid arm and a pivoted arm, a grinding shaft extending through said rigid arm, a motor having a shaft extended through said pivoted arm, a power transmitting device associated with said yoke, said yoke being U-shaped and having an extensible bight portion, and a column supporting the aforesaid elements for reciprocation.

5. A cylinder grinding machine comprising a column, a housing slidably mounted thereon and arranged at one side of the column, a motor carried by and movable with said housing, a grinding mechanism associated with said housing and movable therewith, means establishing a driving connecmovable in an annular path, means operated by the motor for moving the housing vertically on the column, and an automatic reversing mechanism carried by the housing and the column for reversing the direction of travel of the housin and the motor upon reaching the limit of t eir movement in one direction.

6. A portable grinding machine for cyl-' inders comprising a base, a column extending upwardly from the base, a Vertically movable housing slidably connected to the,

column and arran ed at one side of the same, a grinding s aft extending through the housing and having a grinder on the forward end thereof, said grinding shaft being extended a substantial distance in advance of the housing and being considerably less in diameter than the diameter of the grinder whereby to afi'ord a clear view of the grinder in operation and to permit of frequent measurements, inner and outer cooperating eccentrics, arranged within said housing and receiving said shaft for positioning the same, a motor arranged at one side of the column, opposite the housing and having rigid connection therewith, and an automatic reversing mechanism interposed between the motor and the grinder and being mounted on the housing, said reversing mechanism being provided with an actuating contact rod extending longitudinally of the column, and spaced stop elements arranged in the path of travel of said contact rod whereby to operate the same and said automatic reversing mechanism.

ROYAL W. OPF EL. 

